Woodworking Talk banner

1 - 20 of 43 Posts

·
Sawdust Creator
Joined
·
8,046 Posts
Discussion Starter · #1 ·
Alright......So i've been using my delta dust collector for a while now, and its great......However......the filter does get filled up with dust pretty quick....and i'm constantly having to smack the sides of the filter to knock the dust out. So I'm thinking of building a thein baffle. However....heres the twist......I'd like to be able to use a plastic bag on the bottom just like I do on my dust collector. But if its behind the blower, i'm guessing its just going to suck the bag up.

Anyone ever move the blower outboard of the baffle and then use a solid line between the baffle and the dust collector?
 

·
Sawdust Creator
Joined
·
8,046 Posts
Discussion Starter · #3 ·
So....ignore my lame photo shop......but heres what I was thinking....This should allow me to use bags on both instead of a can......

Baffle.jpg
 

·
Sawdust Creator
Joined
·
8,046 Posts
Discussion Starter · #4 ·
My complaint with the regular thein baffle setup is that it requires emptying a can......which seems like a mess. I'm having to change it at least every few weeks, and I like now being able to just unhook the bag and away I go....no mess....
 

·
Sawdust Creator
Joined
·
8,046 Posts
Discussion Starter · #6 ·
So I'm looking at your pictures Dave, and I only see a bottom plate, is that correct?
 

·
Senior Member
Joined
·
7,222 Posts
so i'm looking at your pictures dave, and i only see a bottom plate, is that correct?
Yes, if your plate reference is the baffle, it is simply installed in the bottom of the steel middle section of the dust collector. Just 3 screws.

Being on the discharge of the blower should result in less losses of pressure drop.

It does mean I am not using my baffle to as a pre-separator. I do not suck up large chunks of wood, but the blower impeller is very beefy and can withstand quite an impact.

From your photo shop it looked like you also were not looking for the Thien baffle to be a pre-separator.

This view is of the underside. This will be facing down when installed.

DC_Thien_baffle_installed_1053.jpg
 

·
Sawdust Creator
Joined
·
8,046 Posts
Discussion Starter · #8 ·
I'm not terribly worried about what I suck up, like you it's only sawdust and chips and the occasional small chunk which have always clanked right through. So did you leave the cone you put in in place? Or nothing between the baffle and the top hole up to the filter?
 

·
Senior Member
Joined
·
7,222 Posts
I'm not terribly worried about what I suck up, like you it's only sawdust and chips and the occasional small chunk which have always clanked right through. So did you leave the cone you put in in place? Or nothing between the baffle and the top hole up to the filter?
Sorry to confuse. I started with the intent to make a cone similar to the Jet design, but then changed to just the Thien plywood baffle. In hindsight this was so much simpler and I feel more effective.
 

·
Sawdust Creator
Joined
·
8,046 Posts
Discussion Starter · #10 ·
Dave Paine said:
Sorry to confuse. I started with the intent to make a cone similar to the Jet design, but then changed to just the Thien plywood baffle. In hindsight this was so much simpler and I feel more effective.
So what keeps dust from coming in and going straight up the hole to the filter?
 

·
Senior Member
Joined
·
7,222 Posts
So what keeps dust from coming in and going straight up the hole to the filter?
A very good question, seriously, not trying to be funny.

The air coming into the central collar is spun around at a high velocity.

The velocity creates a lot of centrifugal force. The bigger the particle, the more the centrifugal force will act upon the particle, forcing it to the outside of the central collar.

The baffle essentially acts as a one way stop. The air and the particles on the outside are pushed down into the lower bag. There is no twisting vortex in the lower bag to drag the particles up into the cannister.

This may sound like magic, but it really works.

When I remove my cannister there is no dust on the central collar. The flutes of the cannister have only the smallest particles, which are too light for the centrifugal force to trap.
 

·
Sawdust Creator
Joined
·
8,046 Posts
Discussion Starter · #12 ·
A very good question, seriously, not trying to be funny.

The air coming into the central collar is spun around at a high velocity.

The velocity creates a lot of centrifugal force. The bigger the particle, the more the centrifugal force will act upon the particle, forcing it to the outside of the central collar.

The baffle essentially acts as a one way stop. The air and the particles on the outside are pushed down into the lower bag. There is no twisting vortex in the lower bag to drag the particles up into the cannister.

This may sound like magic, but it really works.

When I remove my cannister there is no dust on the central collar. The flutes of the cannister have only the smallest particles, which are too light for the centrifugal force to trap.

Alright.......so I guess i'm going to give it a try. I had high hopes for the frying pan........but I guess i'm onto trying a baffle If you say yours works......i'll give it a try.
 

·
Registered
Joined
·
1,302 Posts
Alright.......so I guess i'm going to give it a try. I had high hopes for the frying pan........but I guess i'm onto trying a baffle If you say yours works......i'll give it a try.
FTR, several WWs have effected similar enhancements to their DCs with frying pans, woks and sheep metal chimney caps as they mimic the jet "vortex cone".
 

·
Sawdust Creator
Joined
·
8,046 Posts
Discussion Starter · #14 ·
FTR, several WWs have effected similar enhancements to their DCs with frying pans, woks and sheep metal chimney caps as they mimic the jet "vortex cone".

I tried the frying pan....and its better than without.......but not as good as I had hoped which leads me to try something else....
 

·
Sawdust Creator
Joined
·
8,046 Posts
Discussion Starter · #15 ·
Ok.....so I pulled out the pan and built a thien baffle in the dust collector. Every time I pulled the bag to replace it, the filter was full......so here is my attempt....anyone see anything wrong with it?
 

Attachments

·
Sawdust Creator
Joined
·
8,046 Posts
Discussion Starter · #16 ·
Also....i've never been able to get my blast gate at the dust collector to attach as nothing fit over it and over the dust collector port....so its always been duct taped which had to be redone every few weeks when it fell off. Well I bought a 4" adapter that said it would fit.......However it of course didn't. Well I got to looking at it, and grabbed my torch......rolled it across the floor heating it up....and then quickly shoved it on. As it cooled down it fit like a glove!! So to anyone else that can't get dust collector fittings to work, try it. It worked like a charm!!
 

Attachments

·
Senior Member
Joined
·
7,222 Posts
Ok.....so I pulled out the pan and built a thien baffle in the dust collector. Every time I pulled the bag to replace it, the filter was full......so here is my attempt....anyone see anything wrong with it?
Looks alright to me.

This is what mine looks like.

The baffle as it would be during use. I was using 1/4in thick plywood, and intending to screw through the drum, so I glued on three pieces of scrap to increase the thickness so I did not split the wood. I was aiming for the screws to be above the channel of the ring which holds the plastic bag in place.

DC_Thien_baffle_layout_1052.jpg

The view from the underside of the drum. My baffle has narrower spacing than yours. I looked at Phil Thien's site, then made my guess at how much of a slot to cut.

I expect both of ours will work. Ideally I would have tried various slot widths, but that would have taken more time and effort than I wanted.

The main objective of the baffle is to prevent the normal "whirlwind" in the bottom bag which carries debris into the upper cannister. With the baffle you will see the debris swirling in the bottom, but in a downward direction. It does not come back up.

DC_Thien_baffle_installed_1053.jpg

I did not need two ports at my dust collector, so I removed the "Y" and cut out a plywood donut to fit in the collector with a hole which is a tight fit for my fitting.
 

·
Registered
Joined
·
5,526 Posts
I’m a little confused as to what the width of the slot is. I saw a video where the guy said he read it was supposed to be 1 ¼”, but yours looks wider. Does it matter?
 
1 - 20 of 43 Posts
Top